Alkaline water electrolysis hydrogen production waste heat utilization system and method

Abstract

The invention discloses an alkaline water electrolysis hydrogen production waste heat utilization system and method. The system comprises an electrolysis system used for electrolyzing water to generate to-be-treated hydrogen and to-be-treated oxygen; the hydrogen treatment system is used for treating the hydrogen to be treated to obtain hydrogen to be purified, wherein the hydrogen to be purifiedcontains trace oxygen; the oxygen treatment system is used for treating the oxygen to be treated to obtain clean oxygen; the circulation control pipeline is used for controlling the transmission of alkali liquor separated by the electrolysis system; the deoxidation system is used for reacting trace oxygen in the hydrogen to be purified with trace hydrogen to obtain pure hydrogen and water; the waste heat recovery system is used for connecting the circulation control pipeline and the deoxidation system so as to provide waste heat of the alkali liquor conveyed by the circulation control pipelineinto the deoxidation system. Waste heat of alkali liquor after the electrolysis system is utilized to the deoxidation system through the waste heat recovery system to be heated to remove trace oxygenin hydrogen to be purified, extra heating electric energy of the deoxidation system and matched equipment of the deoxidation system are saved, and hydrogen deoxidation is simple.

Description

technical field [0001] The invention relates to the field of hydrogen production systems, in particular to a system and method for utilizing the residual heat of alkaline water electrolysis hydrogen production. Background technique [0002] With the popularization of environmental awareness, water electrolysis hydrogen has become the most popular method of hydrogen production. The general process flow of waste heat utilization for hydrogen production by alkaline water electrolysis is: 30% potassium hydroxide or 25% sodium hydroxide aqueous solution is used as the electrolyte, and the electrolytic cell R usually works at 80±5°C. Water is electrolyzed into H2 and O2 under the condition of direct current in the electrolytic cell R, and enters the hydrogen, oxygen and liquid separators in the gas-liquid post-processing device together with the lye that has not been electrolyzed, and the separated gas is then subjected to gas washing, cool down. In the alkaline water electrolys...

AI Technical Summary

Problems solved by technology

In order to meet the working conditions of the catalyst, it is necessary to use an independent electric heating tube to heat the hydrogen in the traditional deoxidation process. In the heating process, in order to control the temperature of the hydrogen well, it consumes a lot of heat energy

The electric heating tube needs supporting PLC logic control and its supporting intermediate relay, contactor, explosion-proof tube, explosion-proof cap, thermocouple and other devices to control the heating temperature, because the intermediate relay, contactor, electric heating tube and other related electrical equipment are mostly Consumable parts require frequent maintenance and replacement, which increases the complexity, difficulty and cost of the entire hydrogen production

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